Here is the list of the carrier that iPhone comes locked with in each of the countries it is sold or shall be sold.

US – AT&T
Germany – T Mobile
UK – O2
France – Orange
Ireland – O2
Austria – T Mobile
Canada – Rogers
Mexico – Telcel
Italy – TIM
Japan – NTT DoCoMo
Australia – Telstra Mobile
China – China Mobile
India – Bharti Airtel
Spain – MoviStar

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